O2BQIK

I have MTI's stage 2 heads which I bought used (with low miles) for a good price. My car is a '99, but these heads are '98 style, which I decided to disregard since they were such a good price. Could someone please tell me what the differences are between '98 and '99+ heads, and how much power I'm missing out on? My car dynoed pretty low for these mods. It is still using stock computer tuning, and I also am still on the stock clutch which is having all kinds of issues (of course), so slippage may have caused the numbers to be low. Just guessing there.

Anyway, any input is appreciated. Don't get me wrong, I like 393 rwhp...but I'm real interested in why some guys are hitting so much more with similar setups. Details of mine are MTI stage 2 heads, B1 cam, LS6 intake, MAC headers with offroad Y and cutout (cutout open for 393 rwhp), lid, ported MAF, ported TB, 4.10 gears in stock 10-bolt <img src="gr_eek2.gif" border="0"> , HPP3 for rev limiter and speedo correction only, NGK TR55's @ .40, and MSD wires.

The Juggernaut

iTrader: (7)

You're numbers look right on target.You can
probably squeeze 400 RWHP with programming.
BtW-don't worry about dyno #'s, fix the clutch
and get to the track,let's see some MPH!

O2BQIK

Thanks for the input! Normally I wouldn't look too much at dyno numbers, but since I need to spend (what is to me) mega-$$$ to get a clutch, McLeod master, updated slave, and a 12-bolt before I can turn it loose on the track, I was hoping to benchmark a little bit based on HP/TQ.

GeorgeC

AFAIK, the only differences between the 97-98 heads, and the 99-up heads, are the perimeter bolt pattern on the 97-98's, then GM switched to a centerbolt design and mounted the coils on brackets in '99. The ports, combustion chambers, etc. are identical.

O2BQIK

Thanks George!